addressbook.cpp Example File

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#include <QtWidgets> #include "addressbook.h" AddressBook::AddressBook(QWidget *parent) : QWidget(parent) { QLabel *nameLabel = new QLabel(tr("Name:")); nameLine = new QLineEdit; nameLine->setReadOnly(true); QLabel *addressLabel = new QLabel(tr("Address:")); addressText = new QTextEdit; addressText->setReadOnly(true); addButton = new QPushButton(tr("&Add")); editButton = new QPushButton(tr("&Edit")); editButton->setEnabled(false); removeButton = new QPushButton(tr("&Remove")); removeButton->setEnabled(false); submitButton = new QPushButton(tr("&Submit")); submitButton->hide(); cancelButton = new QPushButton(tr("&Cancel")); cancelButton->hide(); nextButton = new QPushButton(tr("&Next")); nextButton->setEnabled(false); previousButton = new QPushButton(tr("&Previous")); previousButton->setEnabled(false); connect(addButton, SIGNAL(clicked()), this, SLOT(addContact())); connect(submitButton, SIGNAL(clicked()), this, SLOT(submitContact())); connect(editButton, SIGNAL(clicked()), this, SLOT(editContact())); connect(removeButton, SIGNAL(clicked()), this, SLOT(removeContact())); connect(cancelButton, SIGNAL(clicked()), this, SLOT(cancel())); connect(nextButton, SIGNAL(clicked()), this, SLOT(next())); connect(previousButton, SIGNAL(clicked()), this, SLOT(previous())); QVBoxLayout *buttonLayout1 = new QVBoxLayout; buttonLayout1->addWidget(addButton); buttonLayout1->addWidget(editButton); buttonLayout1->addWidget(removeButton); buttonLayout1->addWidget(submitButton); buttonLayout1->addWidget(cancelButton); buttonLayout1->addStretch(); QHBoxLayout *buttonLayout2 = new QHBoxLayout; buttonLayout2->addWidget(previousButton); buttonLayout2->addWidget(nextButton); QGridLayout *mainLayout = new QGridLayout; mainLayout->addWidget(nameLabel, 0, 0); mainLayout->addWidget(nameLine, 0, 1); mainLayout->addWidget(addressLabel, 1, 0, Qt::AlignTop); mainLayout->addWidget(addressText, 1, 1); mainLayout->addLayout(buttonLayout1, 1, 2); mainLayout->addLayout(buttonLayout2, 2, 1); setLayout(mainLayout); setWindowTitle(tr("Simple Address Book")); } void AddressBook::addContact() { oldName = nameLine->text(); oldAddress = addressText->toPlainText(); nameLine->clear(); addressText->clear(); updateInterface(AddingMode); } void AddressBook::editContact() { oldName = nameLine->text(); oldAddress = addressText->toPlainText(); updateInterface(EditingMode); } void AddressBook::submitContact() { QString name = nameLine->text(); QString address = addressText->toPlainText(); if (name.isEmpty() || address.isEmpty()) { QMessageBox::information(this, tr("Empty Field"), tr("Please enter a name and address.")); return; } if (currentMode == AddingMode) { if (!contacts.contains(name)) { contacts.insert(name, address); QMessageBox::information(this, tr("Add Successful"), tr("\"%1\" has been added to your address book.").arg(name)); } else { QMessageBox::information(this, tr("Add Unsuccessful"), tr("Sorry, \"%1\" is already in your address book.").arg(name)); } } else if (currentMode == EditingMode) { if (oldName != name) { if (!contacts.contains(name)) { QMessageBox::information(this, tr("Edit Successful"), tr("\"%1\" has been edited in your address book.").arg(oldName)); contacts.remove(oldName); contacts.insert(name, address); } else { QMessageBox::information(this, tr("Edit Unsuccessful"), tr("Sorry, \"%1\" is already in your address book.").arg(name)); } } else if (oldAddress != address) { QMessageBox::information(this, tr("Edit Successful"), tr("\"%1\" has been edited in your address book.").arg(name)); contacts[name] = address; } } updateInterface(NavigationMode); } void AddressBook::cancel() { nameLine->setText(oldName); addressText->setText(oldAddress); updateInterface(NavigationMode); } void AddressBook::removeContact() { QString name = nameLine->text(); QString address = addressText->toPlainText(); if (contacts.contains(name)) { int button = QMessageBox::question(this, tr("Confirm Remove"), tr("Are you sure you want to remove \"%1\"?").arg(name), QMessageBox::Yes | QMessageBox::No); if (button == QMessageBox::Yes) { previous(); contacts.remove(name); QMessageBox::information(this, tr("Remove Successful"), tr("\"%1\" has been removed from your address book.").arg(name)); } } updateInterface(NavigationMode); } void AddressBook::next() { QString name = nameLine->text(); QMap<QString, QString>::iterator i = contacts.find(name); if (i != contacts.end()) i++; if (i == contacts.end()) i = contacts.begin(); nameLine->setText(i.key()); addressText->setText(i.value()); } void AddressBook::previous() { QString name = nameLine->text(); QMap<QString, QString>::iterator i = contacts.find(name); if (i == contacts.end()) { nameLine->clear(); addressText->clear(); return; } if (i == contacts.begin()) i = contacts.end(); i--; nameLine->setText(i.key()); addressText->setText(i.value()); } void AddressBook::updateInterface(Mode mode) { currentMode = mode; switch (currentMode) { case AddingMode: case EditingMode: nameLine->setReadOnly(false); nameLine->setFocus(Qt::OtherFocusReason); addressText->setReadOnly(false); addButton->setEnabled(false); editButton->setEnabled(false); removeButton->setEnabled(false); nextButton->setEnabled(false); previousButton->setEnabled(false); submitButton->show(); cancelButton->show(); break; case NavigationMode: if (contacts.isEmpty()) { nameLine->clear(); addressText->clear(); } nameLine->setReadOnly(true); addressText->setReadOnly(true); addButton->setEnabled(true); int number = contacts.size(); editButton->setEnabled(number >= 1); removeButton->setEnabled(number >= 1); nextButton->setEnabled(number > 1); previousButton->setEnabled(number >1 ); submitButton->hide(); cancelButton->hide(); break; } }

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